. erin? >> all right, thanks very much to you, mary. >>> "outfront" next, the obama administration very concerned about the terror threat in northern africa, warning americans to stay away. >>> and later, facebook's ceo likes chris christie. i know where those two met. will the other tech leaders throw their support behind the gop? >>> welcome back to the second half of "outfront." we start with stories where we focus on reporting from the front lines. we begin with north korea, which warns it plans to carry out a nuclear test that targets the united states, the supposed sworn enemy of the korean people. in the u.s., meanwhile, defense secretary leon panetta says he's very concerned with north korea's continuing provocative behavior, but says that the u.s. is fully prepared to deal with. gordon chang, though, the author of "nuclear showdown: north korea takes on the world" says panetta's remarks are refreshingly candid, but says we should be paying attention, because north korea's words are an escalation in the rhetoric, and this time he thinks north korea has the capability to actually